Tool-holder



J.F.PRAX.

TOOL HOLDER. APPLICATION FIILED JULY 25.1917- 1 ,3 1 5, 640. Patented Sept. 9, 1919.

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JOSEPH. F. PRAX, OF ROCHESTER, NEW YORK.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Sept. 9, 1919.

Application filcd luly 25, 1917. Serial No. 182,733.

To (1Z5 whom it may concern Be it known that I, JOSEPH F. Pnax, a

This invention relates to too]. holders, and

more nn-ticularly to the type used in metal working, in which a tool is supported on the holder provided. with a shank adapted to be secured within the tool post oi. a metal working machine, such for instance, as a lathe. An object of this invention is to provide a tool holder in which provision is made for adjusting the tool toward and from the shank oi the holder, thus doing away with the necessity of providing one or more blocks of various thicknesses within the tool post for the purpose of positioning the shank of the tool holder in such post.

To this and other ends, the invention consists of certain parts and combinations of parts all of which will be hereinafter described, the novel features being pointed out in the appended claim.

In the drawings Figure 1 is a view in elevation of the tool holder showing a tool therein;

Fig. 2 is a longitudinal section through one end of the tool holder;

Fig. 3 is a plan view of one end of the tool holder; and

Fig. 4 is a perspective view of one of the clamping elements.

At the present time it is customary to support the tool upon the tool holder in such a manner that the tool is not adjustable toward and from the shank of the tool holder. lVith this arrangement, the proper position of the tool with reference to the Work must be obtained by adjusting the shank of the tool holder within the tool post of the machine, this adjustment in the tool post being secured by employing blocks oil. various sizes positioned beneath the shank oi. the tool holder and acting as a support for such shank.

According to this invention the shank of the tool holder is supported at any desired position in the tool post of the machine, and the tool is positioned with reference to the work by adjusting such tool toward and from the shank of the tool holder.

Referring more particularly to the drawing machine.

ings where one einbmlirnent of the invention is shown, 1. indicates the shank of the tool holder, this shank being formed like the ordinary shank with a rectangular cross-sew tion at one end adapted to he received with- 1n the slot of the tool post of the metal work At the opposite end of the shank a support 2 is provided, this support being preferably rotatably mounted on the shank by an axis extending longitudinally of said support and transversely of the shank. Rotation in this instance is secured by providing the shank with a transverse opening 3 formed with enlarged bores d and 5 at opposite ends thereof. lVithin the here at is received an annular flange 6 on the support 2, while within the bore 5 a nut or collar 7 is received, said nut being internally threaded and engaging external threads on the support 2 on one side of the flange 6. It is apparent that the nut 7 will firmly draw the flange 6 against the bottom Wall of the bore 1, thus holding the support 2 against rotation. Loosening oi the nut 7 will free the support 2 to permit the latter to be turned on the shank 1 to the desired position.

The support 2 is preferably provided with a longitudinally extending slot 8 within which is received a tool 9. Two clamping 7 elements are employed for supporting the tool 9 at any desired position within the slot 8, this result being secured by making the clamping elements both adjustable longitudinally of the support 2. In this instance, one of these clamping elements is in the form Of an internally threaded. ring 10, which engages external threads on the support 2 and has a concave face 11 for engage, ment by the curved face 12 of a rocking block 13 on which the tool 9 rests. The other clampin element is in the form of a screw 14 adjustable in the upper end of the support 2 to operate in the slot Sior engagement with that face of the tool 9 opposite the face resting upon the rocking block 13. 7

It is apparent that the tool 9 may assume 'arious angles with reference to the shank 1 by rocking the block 13 on the clamping ring 11, the screw 14 holding the tool in its adjusted position. The distance of the tool 9 from the shank 1 may be changed by turningtho ring 10 on the support 2 in order to shift the position of said ring with reference to the shank 1. Of course, during such ad justment of the ring, the screw 14 must be in a position where the adjustment of the ring can take place and, after such adjust ment of the ring 10, the screw 14 is adjusted to engage the tool 9 firmly,

From the foregoing it will be seen that there has been provided a tool holder in which the tool may be adjusted with reference to the shank of the tool holder, to position such tool properly for operation upon the work, thus obviating the necessity of blocking the tool holder within the tool post every time that the position of the tool is required to be changed.

What I claim as my invention and desire to secure by Letters Patent is A tool holder comprising a shank, an externally threaded slotted post projecting laterally from the shank and rotatably mounted on the shank, means for clamping the post in its adjusted position, a rocka'ble 'block on which the tool is supported lying in the slot of the post, an externally threaded ring adjustable axially of thepost and act-o ing as a support for the block, and an adjusting screw for cooperating with the tool supported 011 said block.

JOSEPH F. PRA'X.

copiel of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

' Washington, D. 0." 

